Designed for performance and sound, these large-bore downpipes include high-flow 200 CPSI catalytic converters and GPF/OPF bypass. A must for Stage 2 ECU upgrades.3.00-inch / 76.2mm pipe diameterIncludes 200 CPSI Hi-Flow Sports CatsIntegrated GPF/OPF bypassFits OPF-equipped vehiclesRequires Stage 2 ..